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Photo: Jürgen Regel, Marian…, CC BY 3.0 via Wikimedia Commons
It was founded in 1170 by Frederick Barbarossa (Frederick I, Holy Roman Emperor).
The Imperial Palace at Gelnhausen is located on a former island in the Kinzig river in Gelnhausen, Hesse, Germany.
© OpenStreetMap contributors
A 12th-century church and landmark.
An open-air swimming pool.